Flexible coupling.



G. A. UNGAR.

FLEXIBLE COUPLING.

APPLICATION FILED JAN.9. I9I7.

INVENTOR G (A w w TTORNEY UNGAR.

FLEXIBLi COUPLING.

APPLICATION FILED JAN. 9, 1917.

Pam-11ml Apr. 23%, WW,

jsHEETS SHEET 2.

INVENTOR G1 a, 44 W ATTORNEY I G A. UNGAR.

FLEXIBLE COUPLING.

APPLICATION FILED JAN.9, I9I7.

1,302,248. lntenfvd Apr. 29, 191$).

a SHEETS-S HEET 3.

INVENTOR UNITED STATES PATENT OFFICE.

. eusrav a. UNGAR, or CLEVELAND, OHIO, ASSIGNOB TO I. 'R. BLAIR & 00., me, 035 NEW YORK, N. Y., A CORPORATION OF NEW YORK.

FLEXIBLE COUPLING.

Specification of Letters Patent.

Patented Apr; 29,1919.

' Application niedJanua'ry 9, 1917. Serial No. 141,363.

Z '0 all whom. it may concern:

Be it known that I, GUSTAV A. UNGAR, a

useful Improvements in Flexible Couplings,

of which the following is a full, clear, and exact description, such as will enable others skilled in the art to which it appertains .to make and use the same.

This invention relates to power trans mission mechanism, and with respect to its more specific features, toflexible couplings adapted to serve as torque transmitting dev1ces.

One of the objects of the invention is the provision of a flexible coupling adapted to efliciently transmit the torque.

Another object of the invention is the provision of a flexible disk capable of cfiiciently transmittin the torque, and which will not readily bucEle to an extent to impair its efiiciency.

Another object of the invention is the provision-of a practical connection between a flexible disk and a driving and a driven member, whereby the strain engendered by the torque is applied over a substantial portion of the disk and the connection is maintained throughout the life of the coupling.

Another object of this invention is to facilitate the assemblin of the coupling and to prevent serious accident in case the disks should give way.

Other objects will be in part obvious and inv )art pointed out hereinafter.

.he invention accordingly consists in the features of construction, combinations of elements and arrangement of parts which will be exemplified in the construction hereinafter set forth, and the scope of the application of which will be indicated inthe following claims.

In the accompanying drawings forming part of this specification, and wherein sim1-' lar reference characters refer to similar parts throughout the several views,-

Figure l is an end view of a device embodying the invention;

Fig. 2 is a vertical section of Fig. 1;

Fig. 3 is an end view ,of a modification;

Fig. 4 is a vertical section of Fig. 3;

Fig. 5 is an end view showing another modification; 1

6 is a verticalsection of Fi 5- Fig. 7 is a face view of the flexible disk with an outer plate removed, certain tension threads being enlarged for clearer disclosi Fig. 8 is an edge view qf'the flexible disk; Fig. 9 is a diagrammatlci'vertical sectional view of the flexible disk, showing a step in the making, with the associated plates and tension threads separated;

Fig. 10 is a detailof a portion of the disk around one of the openingsthrough which certain connecting devices pass, showing a. tension thread of exaggerated thickness, for clearer disclosure and v Fig. 11 is a. view showing the modified form of connection between the spider and the disks. I

Beferrin now more specifically to the drawings, t e numeral 1 indicates a rotatable drivin shaft, and the numeral 2'is a rotatable d riven shaft coaxial therewith. These shafts may be regarded as pertaining to any form of rotary power transmitting device, as for instance, the power transmission shaft between the motor and the axle gears of an automobile, wherein it is not uncommon to support the-driving shaftl in such a manner that its plane of rotation moves or vibrates angularly relative to the plane of rotation of the driven shaft 2. For the purpose of transmitting torque from one shaft to the other a driving member is provided on each shaft with an intermediate flexible torque transmitting. element between them. Each of the driving members is connected to the torque transmitting element in such a manner 'as to=produce a tractive effect at circumferentially spaced points around the elements, but in order to permit a certain variation in the position of the axes of the two shafts, the tract-ivc points at which the one driving element is connected to the torque transmitting element are circumferentially spaced from the tractive points at which the alternating with those of the other around torque transmitting element. In the present.

embodiment each shaft is provided with arms or cranks 3 and nforming spiders; of

several arms each, in the present instance three. A flexible annular disk is provided to which the spider arms are connected,.t he points of connection of one spider to the d sk the rotary axis.

The arms 3 and 4 may be connected to the disk by clamping the disk to the' arms by means of clamping members 5, and the clamping members, disks and arms maybe held together by holding means, including tension members 5 extending through the disk, having means for engaging the arms and the clampin members. It is within the broad scope of this invention that any number of tension members may be employed for each clamping member, but certain practical advantages are accomplishedby providing a plurality, as foiexample, two.

' When the shaft 1 is rotated, the shaft 2.

will be driven through the instrumentality of .the flexible disk, while the disk ermits an.

gular variation or movement of t e lane of rotation of the shafts and arms re ative to each other while still transmitting the torque. The flexible disk may be made as ment this thickness is obtained by employing a plurality of the flexible disks, as two, indicated at 6, 6.

To secure the cooperation of the disks in transn'iitting the torque without interfering with the flexibility of the coupling there are preferably provided between the disks, spacing washers 7, 7 which may conveniently be of such form that one washer will fit over both the tension members with which each arm is connected to the disks.

l/Vith a coupling of this type, it is desirable-that the torque shall be transmitted by pressure on the lateral faces of the disk rather than by the pressure of the tension members on the edges of ,perforationsthrough the disk. To insure this, means are provided to distribute the stress'of the tension member over a substantial part of the area of the disk and also to prevent the rotatable to tighten or loosen the holding means.

In the modification illustrated in Fig. 11

the tension members are the legs of U-bolts 18 which pass through the clamping members, the disk and the arms, and carry nuts 19 on the free ends of the legs, rotatable to tighten or loosen the connection. It will beseen that the clamping members 5 are of substantial thickness, those illustrated, for instance in Fig. 4, being of the same thickness as the clampin portion, or jaw,-of the spider. arm. It wi also 'be observed that these jaws clamp the larger portion of the width of the annulus, or flexible disk, radially of the disk. In this wise a large portion of the areaof the flexible disk is between the jaws referred to, and upon the institution-of the clamping action the pressure is transmitted to this large area in a uniform manner, the rigid jaws operating totake the normal clamping strain without substantial deflection.

In order to insure that the torque shall continue to be transmitted by the pressure on the lateral faces of the disk, locking means is provided to prevent the loosening of the holding means, which lockin means is so arranged that it is held rigidly in-order that the holdingl means may be locked thereto. When the olding means is adapted to be tightened and loosened by rotation of. a

rotatable member, as in the constructions may be adapted to engage'various portions of the coupling as well as the holding means they are intended to look, but a practical way of preventing movement of the Washers and at the same time looking a plurality of holding means with simplicity is to-make the washers of such shape that one washer may engage a plurality of tension members, so that each washer is positively restrained from movement and a plurality of holding means may be locked with the same washer. Where a plurality of tension members are employed-for each arm, as in the ,forms illustrated, the washer may fit over two "or more of the tension members of one arm and lock them both. In the construction of Fig. 1. where the tension members comprise stud bolts 8, the washer 9 may fit under the heads of the bolts and have a portion 10 bent up against a flat face of 4 the bolt head. In the construction of Fig. 11 the washer 9 may be under the nuts on the free ends of the U-bolts and have a portion 10 bent up against a flat face of the nut. By looking one bolt against the other,

inafter referred to.

the tendency for the bolt to back out, due to vibrations in the mechanism, is avoided. Thus the compression which is exerted upon the disks when the coupling is first set up isrmaintainedthroughout the life of the cou- In the-modification illustrated in Figs. 3 and 4 there is provided, on each of the arms of one spider, as 3, an inwardly projecting boss 3 at such position as just to fit within and preferably support the edge of the inner opening of the disk when the latter is in place. These bosses, therefore, serve to center and hold the disk in place during the assembling of the coupling, as well as performing another function later to be described. On the spider 4, in this modification, there is provided an annular flange 4. This flange, at the arms 4, is ofan external diameter to fit within and preferably support the edge of the inner opening of the disk similar to the bosses 3 and centers the disk but between the arms 4 the flan e is offset inwardly, as shown at 4", a su cient amount so that when the coupling is assembled, the ortion 4" will lie inside of and radially su ciently spaced from the bosses 3, to permit ready flexing of the coupling. By this construction it will be evident that if the disks should break, the bosses 3 and flange 4 will retain the parts substantially in place and enable the parts to act as a universal joint, thereby preventing the danger which might otherwise attend a failure of the disks at high speed.

In the modification illustrated in Figs. 5 and 6, the arms 3 and 4 lie in the same plane, and the flexibledisks 6, 6 are fastened to one or,"as illustrated, both of the outer sides of the arms. 1 This makes a very compact arrangement for the coupling.

To augment the strength of the disk against circumferential strain, tension members may be secured thereto, preferably in positions to extend between the openings for the studs of one spider and the holes for the studs of the other. These tension members may be of different materials and arranged in different ways, and in the embodiment illustrated consist of strong linen thread of about the same thickness as the threads comprising the textile plates here An outer main tension thread 11 extends successively circumferentially around the outer series of openings 12 for the studs 8, another, or inner main tension thread 13 extends around the inner series of the openings 12", and auxiliary tension threads 14 and 15 extend successively around the alternate outer and inner openings, crossing each other between the openings for the arms of different shafts.

Viewed in some aspects, the, disks may be made of any suitable material, but in the Each textile plate indicated at 16, ,has the several transverse'openings referred to cut therethrough. The warp and weft plate threads, as distinguished from the independent tension threads, thus terminate at the edges of the openings, as seen in Fig. 6. The canvas plates may be rubberized, or may be coated on their opposite faces with rubber,

and the main and auxiliary tension threads referred to are disposed between the laminae. As shown in Fig. 9, the plates are supported on alining pins 17, these pins being of the same shape and diameter as the tension members 5. of the connections, and disposed relatively in the same way. In constructing this disk first, an outer canvas plate is threaded on the alining pins, then if the auxiliary tension threads are to be used, the main and auxiliary tension threads are wound around the alining pins in the manner shown in Fig. 3, and then another canvas plate is threaded onthe alining pins, and so on. This second plate preferably has its war and woof parallel to the warp'and woof o the first plate. Having assembled the numbernof plates and tension threads required to make a disk of desired thickness, the plates are strongly presed together and vulcanized while under pressure, being thus caused to adhere. The tension threads are thus bound in position between the laminae, said threads being in contact with the rubber and embedded in the plates to a certain extent. The openin s in the plates are preferably larger than t 1e pins 17, so that after the disk has been vulcanized, a surface of rubber will lie on the inner surface of each opening.

In assembling the coupling, one or more of the flexible coupling disks 6 are superposed with the spacing washers therebetween and secured to the arms or cranks 3 and i by the studs 8 and clamping plates 5. Upon rotating the shaft 1, the shaft 2 will be rotated through the medium of the flexible disks. Should the axis of the shaft 1 vibrate, or move at an angle to that of the shaft 2, thus changing the angular relation between the planes of rotation of the shafts and respective spiders, the disk will yield or buckle sufficiently to permit the change, as will readily be perceived. The main tension threads 18 and 19 eing straight 1nembers disposed between t 1e arms of diiferent spiders in practical alinelnent with the lines of stress in the disk between successive arms act to, as it were, pull the disks around at symmetrically disposed areas thereof as a considerable portion of the width of the annular portion of the disk prevents any substantial buckling immediately around a clamped portion of the disk, and the buckling will be relegated to the portions between the connection for one arm and the connection for another, the disk buckling or bending more readily at a point midway between the connections and less readily as the points of connection are approached, and the bending or buckling will take place uniformly practicalh over the full width of the annular portion. or at least uniformly over so much of the width as is comprised between the extreme outer and inner edges of the connecting members passing through the disks. This ample width of the disk subject to uniform flexion, while permitting the angular relationship referred to, to vary, resists such buckling or bending even under undue st 'ains, so that the joint resulting is highly efficient and not apt to collapse.

Thus by the above described construction are accomplished, among others, the objects hcreinbefore referred to.

As many changes could be made in the above construction and many apparently widely different embodiments of this invention could b made without departing from the scope thereof, it is intended that all mat ter contained in the above description or shown in the accompanying drawings shall be interpreted as illustrative and not in a limiting sense.

It is also to be understood that the language used in the following claims is intended to cover all of the generic and specific features of the invention herein described and all statements of the scope of the invention which, as a matter of language, might be said to fall therebetween.

Having described my invention, what I claim as new and desire to secure by Letters Patent is:

1. A device of the character described comprising, in combination, two driving members, a flexible torque transmitting element, means adapted to cause a tractive effeet between each of said members and said. torque transmitting element at circumfercntially spaced points around the element,

includmg attaching means having rotative parts and a locking element adapted to lock mutually a plurality'of said rotative parts.

2. A; device of the character described comprising, in combination, two dri ing members, a flexible torque transmitting element, means adapted to cause a tractive effeet between. each of said members and said torque transmitting eiement at circumferentially spaced points around the element by; pressure on the face of the element com- EH'Zsllipf mg me connected to rs respecti ely, clam 1 ,soaaae means comprising rotative parts, and a looking element adapted to lock mutually at least two of said rotative parts.

3. In devices of the character described,

in combination, a driving member and a driven n'ie1nber,.each comprising a spider having arms, a plurality of flexible disks, and means for connecting each of said spider arms to said disks so that torque is transmitted from one spider to the other through the disks comprising a plurality of holding members for each arm, said disks being maintained in spaced relation to each other.

st. In devices of the character described, in combination, a driving member and a driven member, each comprising a spider having rms, a plurality of flexible disks, means for connecting each of said spiders to said disks so that torque is transmitted from one spider to theother through the disks, and means for maintaining said disks in spaced relation to each other comprising washers having roughened faces in engagement with the disks.

5. In devices of the character described, in combination, a driving member and a driven member, each comprising a spider having arms, a flexible disk, and means for connecting each arm of said spiders to said disk so that torque is transmitted from one spider to the other through the disk, said spiders having roughened faces in engagement with the disl.

6. In devices of the character described, in combination, a driving member and a driven member, each comprising a spider having arms, a flexible disk, and means for connecting each arm of'said spiders to said disk so that torque is transmitted from one spider t0 the other through the disk comprising a plurality of holding members for each arm, said spiders having roughened faces in engagement with the disk.

7. In devices of the character described, in combination, a driving member and a driven .member, each comprising a spider having arms, a nexible disk, and means for attaching each of said arms to said disk so that torque is transmitted from one spider to the other through the disk comprising a plurality of holding members for each arm.

8. In devices of the character described, in combination, a driving member and a driven member, each comprising a spider having arms, a flexible disk, means for attaching each of said arms to said disk, so that torque is transmitted from one spider to the other through the disk comprising a clan'iping member and plurality of bolding members for clamping said disk firmly between said arm and s: id clamping mcnn her, said holding members each eomprisimr a member rotatable to tighten or loosen the hold of the holding member, and. means for till Will

lllti mutually locking the rotatable members of each arm against rotation.

9. In devices of the character described, m combination, a driving member and a driven member, each comprising a spider having arms, a plurality of flexible disks. means for attaching each of said arms to sa1d disks, so that torque is transmitted from one spider to, the other through the disks comprising a clamping member and a plurality of holding members for clamping said disks firmly between said arms and said clamping member, said holding members each comprising a member rotatable to tighten or loosen the hold of the holding member, means for mutually locking the rotatable members of each arm against rotation, and means for holding said disks in spaced relation comprising washers on said holdin means.

'10. n devices of the character described, 1n c0mbination, a driving member and a driven member, each comprising a spider having arms, a flexible disk, means for attaching each of said arms to said disk, so that torque is transmitted from one spider to the other through the disk comprising a clam ing member and a plurality of holdmg mem ers for clamping said disk firmly between said arm and said clamping member, each holding member comprising a rotatable member, and a lock Washer for each arm adapted to engage rotatable members of one arm to lock them against rotation.

11. In devices of the character described, in combination, a driving member and a driven member, each comprising a spider having arms, a flexible disk between said spiders, means for attaching each of said arms to said disk so that torque is transmitted from one spider to the other through the disk comprisin a clamping member and a plurality of hol ing members for clamping said disk firmly between said arm and said clamping member, said holding members each comprising a rotatable member r0- tatable to'tighten or loosen the hold of the holding member, and means for mutually looking a plurality I against rotation, the said arms and sa1d clamping members each having rough faces in engagement with the disk.

'. 12. In devices of the character described, in combination, a driving member and a driven member, each comprising a s der having arms, a plurality of flexible ISkS, means for spacing said disks comprismg a member having roughened faces inengagement with the disks so that torque 1s transmitted from one s ider to the other through the disks, means or attachmg each of sa1d arms to said disks comprising a clamping member, and a pluralit of holding members for clamping said isks firmly tween of rotatable members I material having transverse openings of greater diameter than the said holdingsaidarm and said clamping member, said holdmg members each comprising a member rotatable to tighten or loosen the hold of the holding member, and means to mutually lock a plurality of rotatable members against rotation, the said arms and said clamping members each having rough faces in engagement with the disk.

13. device of the character described comprising, in combination, a driving member and a driven member, each comprising a spider having a pluralit of arms, a flexible disk to which each 0 said arms is attached, said members having means adapted to engage, on failure of the disk. to hold the members substantially in alinement.

14. A device of the character described comprising, in combination, a driving memberand a driven member, each comprisin a spider having a plurality of arms, a dis to which each of said arms is attached, one of said members having bosses adapted to fit the inner opening of said disk.

15. A device of the character described comprising, in combination, a driving memthe inner opening of said d1sk an to be radially spaced from said bosses.

16. A torque transmitting member comprising, in combination, a plurality of superposed textile plates having coincident transverse openings spaced a art around the rotary axis, in the edges 0 which openin s the plate threads terminate, said plates eing secured together by a binder, and a lining for each of said transverse openings composed of the binder.

17. A device of the character described comprising,in combination, a drivingmember, a driven m I attaching each of said members to "said disk comprising holding members passing through transverse openings in said disk, said disk being composed of plates of textile members, and a binder for holding said plates together and. for filling the space tween the edges of the o emngs 1n sa1d textile plates and said hol ing members.

18. A, torque transmitting member comprising, in combination, a flexible laminated disk having transverse openings spaced apart aroun the rotary axis, and a flexible tension member embedded therein and extendin from one opening to another spaced there rom as aforesaid, and partly 7 around said latter openings.

19. A torque transmltting member comprising, in combination, a flexible lamina-ted disk having transverse openings spaced apart around the rotary axis, and a flexible tension member between adjacent laminae, extending from one openino to another spaced therefrom as aforesaid and partly .disk having transverse openings spaced apart around the rotary axis, and a flexible tension member between adjacent laminae extending successively from one opening to another around said axis.

22. A torque transmitting member com prising, in combination, a flexible laminated disk having sets of transverse openings spaced apart around the rotary axis, the openings of respective sets being at different distances from said axis, and tension threads between adjacent laminae extending from one opening to another.

23. A torque transmitting member comprising, in combination, a flexible laminated disk having sets of transverse openings spaced apart around the rotary axis, the openings of respective sets being at different distances from said axis, and tension threads betweenadjacent laminae extending from one opening to another and partly around the edges of said latter openings.

24'. A torque transmitting member comprising, in combination, a flexible laminated disk having sets of transverse openings spaced apart around the rotary axis, the openings of respective sets being at different distances from said axis, and tension threads between adjacent laminm ex tending from one outer opening to another outer opening and from one inner opening to another inner opening and partly around the edge of each of said last-mentioned openings.

2.13.- A torque transmitting member com prising, in combination, a plurality of superposed textile plates secured together and having a plurality of coincident transverse openings spaced apart around the rotary axis, in the edges of which openings the plate threads terminate, and independent tension threads extending between the spaced openings.

26. A torque transmitting member comprising, in combination, a plurality of superposed textile plates secured together and recast-a having coincident transverse spaced apart around the rotary axis, in the edges of which openings the plate threads terminate, and independent tension threads between the laminae extending between the spaced openings and partly around the edges of said openings. 7

27. lln a device of the character described, in combination, a rotatable driving shaft, a rotatable driven shaft, said shafts being arranged to permit the axis of rotation of one to move angularly to the axis of rotation of the other, a flexible annular disk intersecting the axes of rotation of said shafts, and means adapted to connect said shafts to said disk, one at a different point from another around said axes, comprising means rotatable with one of said shafts and passing through said disk, said first mentioned means having direct rotary thrust against the lateral face of said disk for a substantial portion of thewidth of the disk.

28. In a device of the character described, in combination, a rotatable driving .shaft,

a rotatable driven shaft, said shaftsbeing' arranged to permit the axis of rotation of one to move angularly to the axis of rotation of the other, a flexible disk intersecting the axes of rotation of said shafts, having transverse openings at difi'erent radial distances from the axis of rotation, and means adapted to connect said shafts to said disk, one at a diflerent pointfrom another around said axes, comprising a plurality of pins connected to one of said shafts and passing through the openings in said disk, one pin through an opening at a different distance from the axis from the pin in another open- 29. In a device of the character described, in combination, a rotatable driving shaft, a rotatable driven shaft, said shafts being arranged to permit the axis of rotation of one to move angularly to the axis of rotation of the other, a flexible isk intersecting the axes of rotation of said shafts, having transverse openings at difl'erent radial disopenings at tances from the axis of rotation, and means adapted to connect said shafts to said disk, one at a different point from another around said axes, comprising a plurality of pins connected to each of said shafts and passing through and fitting radially differently spaced openings in said disk.

30. In a device of the character described, in combination, a rotatable driving shaft, a rotatable driven shaft, said shafts being arranged to permit the axis of rotation of one to move angularly with relation to the axis of rotation of the other, a flexible annular disk composed of laminae of textile fabric secured together, the plane of which disk in tersects the axes of rotation of said shafts.

. rotatable driven shaft, said shafts transverse openings spaced around the axes of rotat1on, the openings of respective pairs being at difl'erent radial distances from said axes, arms rotatable with said shafts, a plurality of pins carried by each arm, the pins of one arm occupying one pair of said openlugs and the pins of the other arms occupying other pairs of said openings, respectively, and tension threads secured between the laminae'extending from a pin of an arm of one shaft to a pin of an arm of the other and partly around and bearing against saidlast-mentioned pins. .31; In a device (if the character described, in combination, a rotatable drivin shaft, a being arranged to permit the axis of rotation of one to move singularly with relation to the axis of rotation of the other, a flexible annular disk composed of laminae of textile fabric secured together, the plane of which disk intersects the axes of rotation of said shafts, said disk having a plurality of pairs of transverse openings spaced around the axes of rotation, the openings of respective pairs being at different radial distances from said axes, arms rotatable with said shafts, a plurality of pins carried by each arm, the pins of one arm occupying one pair of said openings and the pins of the other arms'occupying other pairs of said openings, respectively, and tension threads secured between the laminae, extending from the pins of an arm of one shaft to the pins of an arm of the other, and bearing against said lastmentioned pins.

32. A device of the character described comprising; in combination, a driving member and a driven member each comprising a spider having arms, a flexible disk to transmit torque between the arms of one member and those of the other, and means for attachin said disk to an arm comprlsing a plurality of bolts passing through said disk, nuts for said bolts, and a washer engaging said bolts and having portions adapted'to be bent into engagement with said nuts to lock them against rotation. I 33. A device of the character described comprising, in combination, two driving members, a flexible torque transmitting element, means adapted to cause a'tractive effect between each of said members and said torque transmitting element at circumferentially spaced points around the element by pressure on the faceof the element comprising respective clamping members for each of said points and a plurality of holding members foreach clamping member.

34. A device of the character described comprising, in combination, two driving members, a flexible torque transmitting element, means adapted to cause a tractive effect between each of said members and said ing respective clamping members for each of said points and a plurality of holdin members for each clamping member, sai

' holding members penetrating said disk.

35. device of the character described comprising, in combination, two driving members, a. flexible torque transmitting element, means adapted to cause a tractlve effeet between each of said members and said torque transmitting'element at circumferentially spaced points around the element by pressure on the face of the element comprising respective clamping members for each of said points and a plurality of holdin members for each clamping member, said riving members having means adapted to engage, on failure of the disk, to hold said driving members in substantial alinement.

36. In a torque-transmittin flexible coupling, in combination, a flexib e disk, clamping jaws between which said disk is disposed, and means adapted 'to effect clamping of the disk between the jaws comprising a plurality of bolts extending through said disk and oneof said jaws, one of said bolts being spaced from another transversely of thelme of torque strain, said last mentioned jaw comprising a rigid member adapted to positively clutch said disk.

37 In a torque-transmittin flexible coupling, in combination, a. flexib e disk, clam ing jaws between which said diskis d sposed, nd means adapted to effect clamping of the disk between the jaws comprising a disk and oneof said jaws, one of said bolts being spaced from another transversely of a the line oftorque strain, said last mentioned jaw comprising a rigid member adapted to positively clutch said disk, nuts for said bolts, and a washer through which at least two bolts pass, adapted to lock said nuts. I

38. ,Ina torque-transmittin flexible coupling, in combination, a flexib e disk, clamping jaws between which said disk is d1sposed, and means adapted to effect clamping of the disk between the jaws comprisin a plurality of tension members extending through said disk and one of said jaws, one of said tension members being spaced from another transversely of the line of torque strain, said last mentioned jaw comprising a rigid member adapted to positively clutch said disk.

39. A device of the character described comprising, in combination, a rotary driving member, a rotary driven member, a flexible disk connected to said members, to one independently of the other, whereby upon rotamemes adapted to cooperate with the periphery of said disk to center the same on one of said members.

40. A device of the character described comprising, in combination, a rotary driving member, a rotary driven. member, a flexible disk connected to said members, to one independently of the other, whereby upon rotattion torque is transmitted from one member 10 to the other through the disk, and means carried by each member adapted to cooperate with the periphery of said disk to center the same on said members.

In testimony whereof affix my signature, in the presence of two Witnesses.

GUSTAV A. UNGAR.

Witnesses H. M. SnAMANs, WILLIS B. RICE. 

